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From what I can see that is not an OST, but a collection of radio 'shows'.

Edit: Darn I was slow... the price is exactly the same @ above. There's a single with (Kamina's seiyuu) and Marina Inoue (Yoko's seiyuu) songs coming out on July 25th though, if anyone cares. I loved all Marina Inoue songs so far, so, hurray for me.

Do any of you guys know the name/artist of the song playing during episode 11?
It was awesome!
Thanks.

If you mean the song that was playing for Simon's scene at the end, its by Shoko Nakagawa, the same singer who does the OP. The song you're looking for shall appear on the OP single which is being released next week.